Road-surface preparation or composition.



To all whom it may concern:

UNITED STATES P TE WILLIAM ALFRED MEA OWS AND SYDNEY CARTER MEADOWS, or LIVERP OL, ENGLAND? a;

ROAD-SURFACE PREPARATION QR COMPOSITION.

Specification of Letters Patent.

Patented June a; 19cc.

Application filed November 20, 1907. Serial 110,408,024.

Be it known that we, VILLIAM ALFRED MEADows and SYDNEY CARTER ME DOWS,

subjects of the King of-En 'land, residing at Liverpool, in the county of Lancaster, Eng

land, have invented new and useful -Improvements in Road-Surface Preparations or Compositions, of which the following is a other roads or surfaces Where suitable-for' specification.

This invention has reference to compositions for applying to the surface of or dressing macadam or similar roads-or to According to this invention, the compo-' sition comprises, before ap lyingit to the surface, (a) that portion of coal-tar which remains after the removal therefrom ofthe middle and, heavy oilsthat is, coal tar which has been distilled at temperatures up to about 240 to 260 centigrade, and lwill therefore consist of pitch and anthracene oil; and (b)"coa1 tar naphtha of a specific gravity of about .900 to .960, or any suitable spirit that will combine with the compound, and is cheap, which is added to'the distilled tar. Thus the preparation is effected by distilling coal taruuntil all the lighter distillates are driven ofl, and only pitch and the anthracene oils remain, this condition being reached bya temperature of about 240 to 260 centigrade, as stated, and then adding to it a spirit, such as'some of the crude coal tar naphtha distilled from coal-tar, with the advantageous objects and effects rev ferred to. p H The composltlon or compound containing the spirit, may be applied to a road surface in acoldstate, and, after a' short time, the coal tareconsisting of pitch and anthracene oilwill be left upon the surface, the spirit, or most *of' it, being evaporated in and by the air; its function being chieflg that of a vehicle by whichthe coal-tar can' e used and applied without any heating operation or coal tar naphtha, in the proportions subapparatus, that is, with great convenience,

but also having the effect of causing the compound to penetrate better into the surface, and generally improving the road dressing or covering, as above stated.

The quantity of anthracenes in the compound should be not less than about a to of the weight of the pitchconstituent, and if this'quantity be not present in the complound when it is discharged from the still, it s ould eflected, 2'. e., crack, or become sticky or soft by either frost or heat; or, in other words, it remains unaffected, practically entirely, under all ordinary or. usual meteorological conditions; and it isa very lasting, and at the same time an effective dust raising preventing medium .on roads ofthe kind referred to, in dry weather, and a binder in connection with same; and a mud preventing medium in ,wet weather.

The specific ravit-y of the composition without the spirit is about 1.20, and after the spirit is added the whole has a specific gravity of about 1.196.

The amount of naphtha spirit which is necessary to produce the results or effects referred to, is about from 10 per cent, to 17 per cent. of the distilled coal tar residue.

If desired, the composition may have addedto it any substances which do not affect its nature or character as herein described, or are inert as regards its purposes and effect.

What is claimed is I 1 1 1. The herein described dust laying composition, consisting of a mixture of that portion of coal-tar remaining after the removal therefrom of the middle and heavy oils, and

stantially as'specified.

2. A dust preventing COIIIPOSIUOIL for application to road surfaces 1n a cold state, comprising a coal tar compound, consistm of from -th to ith in weight of pitch, an gths to gths in weight of anthracene oil, andv from 10 to 17 one-hundredths inweight of coal tar naphtha.

3. The herein described improvement in the manufacture of dust-laying compositions, consisting in effecting the preparation thereof, by distilling coal tar to the point at 5 which it contains practically only pitch and the anthracene oils, then stopping the distillation, and subsequently adding coal tar naphtha.

4. The method of manufacturing the dust 10 preventing composition for application to road surfaces in a cold state, consisting in distilling tar up to a temperature of between 240 C. to 260 .C. to remove the middle and heavy oils, partly cooling the distilled residue of pitch and anthracene oil, and adding coal tar naphtha to the artly cooled residue. In testimony whereoi we have signed our names to this specification in the presence of two subscribing witnesses. WILLIAM ALFRED MEADOWS.

SYDNEY CARTER MEADOWS. Witnesses:

SOMERVILLE GoonALL, WALTER MONTAGUE HAnmson. 

